/Engine/Plugins/Animation/MLDeformer/MLDeformerFramework/Source/MLDeformerFramework/Public/MLDeformerModel.h
Set the maximum number of frames to train on. For example if your training data has 10000 frames, but you wish to only train on 2000 frames, you can set this to 2000.
void SetTrainingFrameLimit ( int32 MaxNumFrames )